s = {10, 20, 30}
s.add(100)
print(s)

s.remove(100)
print(s)

for k in s:
    print(k)

for k in enumerate(s):
    print(k)

s2 = { item for item in range(10) }
print(s2)

s3 = { item for item in range(10) if item%2 == 1 }
print(s3)